Theoretical Investigations of the Ultrasonic Wave Generation by an Electromagnetic Acoustic Transducer

Gregory S. Tymchik, Aleksandr A. Podolian, Kateryna S. Serhiienko


Background. The article considers the analysis of the electromagnetic acoustic (EMA) converter with controlled angular input of acoustic waves, using parameters influencing the formation of an acoustic wave.

Objective. The aim of the paper is to analyze the formation of an acoustic wave with angular input in the EMA converters of non-destructive testing systems.

Methods. Mathematical modelling was used to investigate the influence of the distance from the yarn-emitters to the control object surface. The influence of various factors (current magnitudes, external magnetic field values, distance from the yarn-emitter and the grating to the control object surface) is investigated with the help of mathematical modeling.

Results. The optimal value of the magnetic induction of an external magnetic field is shown. The calculation of the pressure created by the yarn-emitters and the grating on the controlled object surface was carried out. A formula for the ultrasonic wave input angle was obtained. The formula depends on the parameters of the control environment, the distance between the emitters, the phase shift between the harmonic current signals applied to the adjacent emitters and the harmonic signal frequency. It was found that a change in the angle between the EMA transducer and the surface of the control object leads to a significant deterioration in the acoustic wave generation on the surface of the controlled object.

Conclusions. We investigated the possibility of the angular input of an ultrasonic wave using system of parallel-arranged yarn-emitters. A decrease in the acoustic pressure, with increasing distance from the yarn-emitters to the controlled object surface was observed.


EMA transducer; Acoustic pressure; Non-destructive testing; Angular input; Ultrasonic wave

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F. Kliuev et al., Non-Destructive Testing and Diagnostics: Reference Guide, F. Sosnyn et al., eds. Moscow, Russia: Mashinostroenie, 2005, 656 p.

O. Podolian, “Forming of a magnetic field with given characteristics in EMA converters of systems of nondestructive testing of industrial equipment”, Methods and Devices for Quality Control, vol. 17, pp. 18–21, 2006.

O. Podolian, “EMA converter”, RU Patent 2006116939, June 6, 2008.

H. Tymchyk and O. Podolian, “Formation of special-shaped pulses for electromagnetic acoustic transducers”, Bulletin of the NTUU KPI. Ser. Instrument Making, vol. 4, pp. 64–69, 2013.

B. Yavorskyi and A. Detlaf, Physics Reference. For Engineers and University Students. Moscow, SU: Nauka, 1978.

Yu. Sazonov, Wave Electromagnetic Acoustic Phenomena in Condensed Media and Physical Methods of Their Usage. Moscow, Russia: GEOS, 2003.

A. Malynka et al., “Electromagnetic-acoustic method for controlling ferromagnetic sheets and tubes”, Defectoscopy, vol. 4, pp. 44–48, 1972.

V. Komarov, “Modeling of manifestations of electromagnetic acoustic transformation in metals I. Transformation of a quasi-stationary inhomogeneous electromagnetic field into elastic shear oscillations”, Control. Diagnostic, vol. 3, pp. 17–25, 2013.

V. Tsapenko and Yu. Kuts, The Basis of Ultrasonic Non-Destructive Testing. Kyiv. Ukraine: NTUU KPI, 2010.

H. Budenkov and O. Korobeinykova, “Influence of chemical composition and metal temperature on the efficiency of electromagnetic acoustic transformation”, Defectoscopy, vol. 4, pp. 40–49, 2009.

A. Malynka, “Radiation and reception of ultrasonic oscillations at a given angle with the electromagnetic-acoustic method”, Defectoscopy, vol. 5, 1979, pp. 16–20.

V. Stryzhak et al., “Information-measuring system of excitation, reception, registration and processing of signals of electromagnetic acoustic converters”, Intelligent Systems in Manufacturing, no. 1(17), pp. 243–250, 2011.

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